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i need urgent help in >> telephone signaling module

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  1. [1]
    k_general
    k_general غير متواجد حالياً

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    تاريخ التسجيل: Mar 2009
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    i need urgent help in >> telephone signaling module

    hi all

    i got this task today and i have to solve it within two days i really need any help

    the task :


    Design and implement a telephone signaling module that generates standard signaling tones ( dial, ringing, ringing back, busy tone).that is to say to bring us a complete circuit that generates those tones through a speaker. Use any hardware which will help from your point of view ( Ics , Microcontroller or anything you need).

  2. [2]
    ماجد عباس محمد
    ماجد عباس محمد موجود حالياً
    مشرف متميز


    تاريخ التسجيل: Sep 2006
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    It is a set of audio oscillators , generate the following frequencies
    350Hz+440Hz for dial tone
    480+620 for busy tone
    440+480 for ring back
    24 ring tone
    Dial tones can not be generated this way for their higher accuracy, so use This chip UM91214 and a standered crystal 3.58MHz

    download its data sheet from

    http://www.alldatasheet.com

    http://www.alldatasheet.com/datashee...C/UM91214.html

    0 Not allowed!



  
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